import React, { PureComponent } from 'react';
import { connect } from 'react-redux'
import { actionCreators } from "./store"

import Topic from './components/Topic';
import List from './components/List';
import Recommend from './components/Recommend';
import Writer from './components/Writer';

import {
  HomeWrapper,
  HomeLeft,
  HomeRight,
  BackTop
} from './style'

class Home extends PureComponent {

  handleScrollTop() {
    window.scrollTo(0, 0)
  }

  render() {
    return (
      <HomeWrapper>
        <HomeLeft>
          <img className='banner-img' alt="" src="//upload.jianshu.io/admin_banners/web_images/4582/2db83cc6f08d13c2f83002238ca32b784266c4fb.jpg?imageMogr2/auto-orient/strip|imageView2/1/w/1250/h/540" />
          <Topic />
          <List />
        </HomeLeft>
        <HomeRight>
          <Recommend />
          <Writer />
        </HomeRight>
        {
          this.props.showScroll ? <BackTop onClick={this.handleScrollTop}>回到顶部</BackTop> : ''
        }
        
      </HomeWrapper>
    )
  }

  componentDidMount() {
    this.props.changeHomeData();
    this.bindEvents();
  }

  componentWillUnmount() {
    window.removeEventListener('scroll', this.props.changeScrollTopShow)
  }

  bindEvents() {
    window.addEventListener('scroll', this.props.changeScrollTopShow)
  }
}

const mapState = state => ({
  showScroll: state.getIn(['home', 'showScroll'])
})

const mapDispatch = dispatch => ({
  changeHomeData() {
    dispatch(actionCreators.getHomeInfo())
  },
  changeScrollTopShow() {
    if (document.documentElement.scrollTop > 200) {
      dispatch(actionCreators.toggleTopShow(true))
    } else {
      dispatch(actionCreators.toggleTopShow(false))
    }
  }
})

export default connect(mapState, mapDispatch)(Home)
